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H CALMELS LE MA Ets
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H CALMELS LE MA Ets
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Application filed by H CALMELS LE MA EtsfiledCriticalH CALMELS LE MA Ets
Application grantedgrantedCritical
Publication of FR614752ApublicationCriticalpatent/FR614752A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
G03B13/18—Focusing aids
G03B13/24—Focusing screens
G03B13/26—Focusing screens with magnifiers for inspecting image formed on screen
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR614752D1926-04-191926-04-19Dispositif de support pour châssis photographiques de grandes dimensions
ExpiredFR614752A
(fr)